Panasonic DMW-BLF19 Lumix DMC-GH3 Replacement Battery 7.4V

Panasonic Lumix DMC-GH3 Series — 7.4V Li-ion Replacement Battery (DMW-BLF19)

This 7.4V, 1100mAh Li-ion cell replaces the DMW-BLF19 and DMW-BLF19E batteries in the Panasonic Lumix DMC-GH3 mirrorless camera family. It fits the GH3, GH3A, GH3AGK, and GH3GK, among others. Voltage and chemistry match OEM spec exactly.

• GH3 series compatibility: All models in this lineup share the same battery compartment geometry, 7.4V voltage rail, and DMW-BLF19 connector pinout. The BMS on each body reads the same handshake signal, so one cell covers the entire range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a GH3 body. The BMS accepted the cell without error flags, and the battery-remaining indicator tracked correctly after one full charge cycle completed inside the camera body.
• First-use charge cycle on GH3: Charge this cell fully inside the GH3 body or OEM charger before your first shoot. The GH3 BMS maps its battery-percentage display to a discharge curve it calibrates on that first cycle — skipping it causes the indicator to read inaccurately throughout the cell's life.

Why the GH3 battery percentage jumps erratically with a new cell

The GH3 uses a voltage-threshold method to estimate remaining charge. A new cell has a slightly different discharge curve slope compared to a worn OEM battery the camera has adapted to. Until the BMS completes one full charge-discharge cycle with the new cell, the thresholds don't align and the percentage reading can jump — dropping suddenly from 60% to 20%, or stalling near full. One complete cycle from 100% to near-empty resolves this. After that, the indicator tracks consistently.

Shot count dropping sharply during sustained 4K video on the GH3

4K recording on the GH3 draws simultaneously from the sensor, image processor, in-body stabilisation, and the EVF or rear LCD — combined current draw is significantly higher than still shooting. A 1100mAh cell under that combined load will reach the BMS low-voltage cutoff faster than spec shot counts suggest, because those counts are based on CIPA still-photo standards. If the camera cuts out during a video session, check that the cell is reading above 7.0V before starting a long clip. For extended video work, carry a second cell.